JPS60128972A - Multi-pole magnet generator for contactless igniter of internal-combustion engine - Google Patents

Abstract

PURPOSE:To achieve single ignition per single rotation reliably by winding a firing source coil such as capacitor charging coil across two salient poles adjoining each other and bringing the output voltage at unnecessary portion to zero through cancelling of flux. CONSTITUTION:A plurality of magnets 2 are arranged in ring on the innercircumference of iron arm 1 made of magnetic member directly coupled to crank shaft and rotated. The magnets 2a-2e are magnetized such that N-pole is produced at the inner diameter side while magnets 2f-2l are magnetized to produce S and N poles alternatively. A star core 3 made of laminated magnetic iron plates is contained at the inside of said ring magnet 2 where the salient poles 3a, 3b in those 3a-3l projecting radially outward are used for charging of capacitor while 3c-3l are used for lighting or battery charging. Then capacitor charging coil 4 is wound across said poles 3a, 3b while output salient pole 5 is wound over the salient poles 3c-3l.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-pole magnet generator for a non-contact ignition device for an internal combustion engine.

[Prior art]

In conventionally well-known devices of this kind, an ignition signal generator was installed separately to obtain the ignition signal, but the ignition signal generator is expensive, requires installation space, and is difficult to install. It is necessary to perform positioning accurately,
It required a lot of man-hours.

Therefore, as shown in Japanese Patent Publication No. 49-46163,
The coil is divided and wound around each salient pole of a core formed with many salient poles, and these divided windings have the same number of turns.
In addition to changing the winding direction and connecting them in series, the magnetic rotor is constructed so that magnetic changes appear in most of the circumferential direction, but there is no magnetic change in a part of the circumference. It has been considered that one ignition spark can be generated per revolution of the motor.

However, in the above-mentioned conventional method, the voltages generated in the divided and wound coils are of opposite polarity and cancel each other out to reduce the output voltage in unnecessary parts to zero, so this coil is used for capacitor charging. When used as a coil, several KV is applied to both sides of the coil in the high speed rotation range.
The drawback was that a large no-load voltage was generated, which could cause dielectric breakdown of the coil.

[Purpose of the invention]

In order to solve the above-mentioned drawbacks, the present invention winds an ignition power supply coil such as a capacitor charging coil across two adjacent salient poles, and makes the output voltage in unnecessary parts zero by canceling out the flux. The object is to be able to fire once per revolution without generating a large no-load voltage even in a high-speed rotation range.

〔Example〕

The present invention will be described below with reference to the embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes an iron fence made of a magnetic material, which is directly connected to the crankshaft of an internal combustion engine and driven to rotate. 2 is a ring-shaped magnet as a whole placed and fixed on the inner circumference of the iron fence 1, and is magnetized in the radial direction; 2a to 2e are magnetized so that the N pole is generated on the inner diameter side;
Until now, the S pole and N pole have been magnetized alternately, and of the total of 12 poles, consecutive 5 poles have been magnetized.
The poles are magnetized to the same polarity. 3 is a star-shaped core made of laminated magnetic iron plates, and has 12 salient poles 3a to 31 formed at approximately equal intervals that protrude outward in the radial direction, of which 3a and 3b are protrusions for charging a capacitor. The poles 30 to 3A' are output salient poles for lighting or battery charging.

4 is a capacitor charging coil wound across two adjacent salient poles 3a and 3b, one end of which is connected to the capacitor 11 via a diode 10 as shown in FIG. 2, and the other end is grounded. . In addition, each of the remaining protrusions 30~
A coil 5 for lighting or battery charging is wound around 3β and connected in series with each other. In addition, each salient pole 3a~
The outer circumferential surface of 3β faces the inner circumferential surface of the magnet 2 with a small gap therebetween. 6 is a screw for tightening and fixing the core 3 to the side wall of the internal combustion engine.

FIG. 2 is a circuit diagram, in which when a positive voltage DI is generated in the capacitor charging coil 4, from its one end 4a, the diode 10 and the primary coil 16a of the capacitor charging coil 16 are connected.
1 diode 14 and the ground to the other end 4b of the capacitor charging coil 4, and the current flows through the capacitor 11
It forms a circuit that charges the battery. Further, when a negative direction voltage D2 is generated in the coil 4, the other end 4b is connected to the ground,
Gate of thyristor 12, cathode of thyristor 12,
A current flows through the diode 15 to one end 4a of the capacitor charging coil 4, forming a circuit that turns on the thyristor 12.

Here, when the thyristor 12 is turned on, the capacitor 11
The electric charge stored in the ignition coil 16 is rapidly discharged to the primary coil 16a of the ignition coil 16 through the thyristor 12, and a high voltage is generated in the secondary coil 16b, causing the ignition plug 17 to ignite. Note that the resistor 13 is a resistor for adjusting the ignition timing. FIG. 3 shows the waveforms of various parts in the above configuration. (A) shows the flux waveform passing through the salient pole 3a, (B) shows the flux waveform passing through the salient pole 3b, and (C) shows both of these Franks waveforms. The flank waveform (D
) is a voltage waveform generated in the capacitor charging coil 4.

In the above configuration, the capacitor charging coil 4 is wound without being divided across two adjacent salient poles 3a and 3b, and these two salient poles 3a and 3b are alternately magnetized by the magnet 2. When the opposite portion (2f to 2ρ) is engaged, the flux passing through one salient pole 3a (Fig. 3 (A))
The flux passing through the other salient pole 3b (FIG. 3(B)) is opposite to each other and cancel each other out, so that the section T2 in FIG. 3 is the capacitor charging coil 4 as shown in FIG. It is the same as if the flux was not distributed. In addition, the part where the magnets 2 are connected and magnetized to the N pole (
In 28 to 2e), the flux passing through one salient pole 3a and the flux passing through the other salient pole 3b are in the same direction,
These two fluxes are added to the capacitor charging coil 4, and a large amount of flux is intersected as shown in FIG. 3(C) during the section T1, and the positive direction voltage is increased as shown in FIG. 3(D). D1 and a negative direction voltage D2 are generated, of which the positive direction voltage D1 charges the capacitor 11, and the negative direction voltage D2 is applied to the thyristor 12 as a gate signal.

In addition, in this example, the part where the magnet is continuously magnetized to the N pole is set to 5 poles, but the number of poles can be changed arbitrarily from 2 to 9 depending on the ignition timing, the required value of the capacitor voltage, etc. You can change it. Also, even if the part that is continuously magnetized is N pole,
The same effect can be obtained with either S pole. In addition, in the above-mentioned embodiment, the total number of poles was 12, but 4
Any type of multi-pole magnet generator with more than one pole may be used. However, in the case of an odd number of poles, the output becomes small, so it is preferable to use an even number of poles.

In addition, as shown in Fig. 1, the capacitor charging coil 4
By forming the coil winding portions of the two adjacent salient poles 3a and 3b that are wound in parallel to each other in close proximity to each other, the amount of wire used in the coil 4 can be reduced. 3a.

The distance between the salient poles 3C13j+ on both sides of the coil 3b is widened, and the winding space of the coil 4 can be widened.

Further, in the above embodiment, the negative direction output of the capacitor charging coil 4 was used as the ignition signal, but it is also possible to wind a signal coil around one of the salient poles 3a to 31 of the core 3, or to A signal coil may be wound around the poles 3a and 3b in the same manner as the capacitor charging coil 4, and the output of the signal coil may be used as an ignition signal to control the thyristor 12.

Also, as shown in FIG. 4, two adjacent salient poles 3a.

By providing a plurality of capacitor charging coils 4.4' wound across 3b and 38'l 3b', it can be applied to a multi-cylinder ignition system. A capacitor charging coil 4, 4'' is wound across two adjacent salient poles 3a, 3b and 3a'', 3b'.
If two are placed next to each other and connected in a summative manner, the capacitor voltage can be doubled.

In each of the embodiments described above, the present invention was applied to a capacitor discharge type ignition device, but it is also possible to directly intermittent the output voltage generated in the ignition power supply coil by a transistor without using a charging/discharging capacitor. The present invention can also be applied to a transistor type ignition device that induces a high voltage in an ignition coil.

〔Effect of the invention〕

As described above, in the present invention, an ignition power supply coil is wound across two adjacent salient poles of a core in which a plurality of salient poles protrude at approximately equal intervals in the radial direction, and the magnetic rotor In the part where a change appears, the fluxes of the two adjacent salient poles around which the ignition power supply coil is wound are canceled out, and in the part where there is no magnetic change, the fluxes of each of the above two salient poles are added, and the two poles are wound together. Since the ignition power supply coil has a flux change corresponding to two poles, by canceling out the flux, the output voltage in the unnecessary part of the ignition power supply coil is reduced to zero, thereby generating a large no-load voltage even in the high speed rotation range. This has the excellent effect of being able to ignite once per rotation of the magnet generator without causing any ignition.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional plan view showing one embodiment of the generator of the present invention, Fig. 2 is an electric circuit diagram of an ignition system to which the generator shown in Fig. 1 is applied, and Fig. 3 is an explanation of the operation of the above embodiment. Waveform diagrams of each part provided, 4th TI! J and FIG. 5 are other two generators of the present invention.
FIG. 3 is a partially sectional plan view showing two embodiments. ! , 2... Iron fence and magnets forming the magnet rotor, 3-:
Ia, 3a to 3C3a', 3a", 3b'. 3b'... salient pole, 4.4', 4'... capacitor charging coil forming the ignition power supply coil, 5... lighting or Coil for battery charging. Patent attorney Takashi Okabe Fig. 1 2λ Fig. 2 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] (11) A core having a plurality of protruding salient poles at approximately equal intervals in the radial direction, an ignition power supply coil wound across two adjacent salient poles of the core, and A stator is equipped with a lighting or battery charging coil wound around salient poles.Radially magnetized magnets are arranged circumferentially to form a substantially cylindrical shape, It consists of a magnet rotor having a large number of magnetic poles arranged so that a magnetic change appears in one part and a part without a magnetic change, and the ignition power source coil is connected to the part where the magnetic change appears. The fluxes of the two adjacent salient poles of the wire are in opposite directions, and the ignition power source coil, which is wound to match the two poles, is in a state where there is no flux change, and the part where no voltage is generated is defined as the part where there is no magnetic change. Now, the fluxes of each of the two adjacent salient poles around which the ignition power supply coil is wound are added, and a flux change corresponding to the two poles appears in the ignition power supply coil wound together with the two poles, and a voltage is generated. A multi-pole magnet generator for a non-contact ignition device for an internal combustion engine. (2) The coil winding portions of two adjacent salient poles around which the ignition power supply coil is wound are formed close to each other. A multi-pole magnet generator for an internal combustion engine non-contact ignition device according to claim 1.